package com.itheima.reggie.controller;

import  com.itheima.reggie.common.R;
import  org.springframework.beans.factory.annotation.Value;
import  org.springframework.web.bind.annotation.GetMapping;
import  org.springframework.web.bind.annotation.PostMapping;
import  org.springframework.web.bind.annotation.RequestMapping;
import  org.springframework.web.bind.annotation.RestController;
import  org.springframework.web.multipart.MultipartFile;
import  javax.servlet.ServletOutputStream;
import  javax.servlet.http.HttpServletResponse;
import  java.io.File;
import  java.io.FileInputStream;
import  java.io.IOException;
import  java.util.UUID;
@RestController
@RequestMapping("/common")
public  class  CommonController {
    @Value("${reggie.path}")
    private  String basePath;
    /**
     * 文件下载
     */
    @GetMapping("/download")
    public  void  download(String name, HttpServletResponse response){
        try  {
//输入流，通过输入流读取文件内容
            FileInputStream fileInputStream = new  FileInputStream(new  File(basePath + name));
//输出流，通过输出流将文件写回浏览器
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jpeg");
            int  len = 0;
            byte [] bytes = new  byte [1024];
            while  ((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
//关闭资源
            outputStream.close();
            fileInputStream.close();
        } catch  (Exception e) {
            e.printStackTrace();
        }
    }
    /**
     * 图片上传
     */
    @PostMapping("/upload")
    public  R<String> upload(MultipartFile file){
//获取上传的原始图片名
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
//使用UUID重新生成图片的名称，防止文件名称重复造成图片覆盖
        String fileName = UUID.randomUUID().toString() + suffix;
//创建一个目录对象
        File dir = new  File(basePath);
//判断当前目录是否存在
        if (!dir.exists()){
//目录不存在，则创建
            dir.mkdirs();
        }
        try  {
//将上传的图片转存到指定位置
            file.transferTo(new  File(basePath + fileName));
        } catch  (IOException e) {
            e.printStackTrace();
        }
        return  R.success(fileName);
    }
}
